(53) 
70. Esox lucius L. Pike, Grass Pickerel. (M. V. 266; E. lucius y ar- 
estor , and E. boreus , Neison 48.) 
Very abundant in all large streams in the northern third of the 
state, its distribution being similar to that of Perea. Rock R., 
111. R. 
71. Esox salmoneus Raf. Little Pickerel. (M. Y. 267 ; E. salmoneus 
and E. umbrosus Nelson 43.) 
Everywhere very abundant in ponds and bayous; especially com- 
mon in ponds in Union Co.; also specimens from Fox R., and 111. 
R. at Pekin. 
72. Esox cypho Cope. Humpback Pickerel. (M. Y. 267 ; Nelson 43.) 
The specimen referred to by Mr. Nelson, from the Fox River at 
Geneva, is the only one which I have seen from the state. 
[73. Esox ravenelli\ Holbr. 
A small, barred pickerel from Union Co., much more slender than sal- 
moneus , with smaller scales, longer dorsal and anal fins, and different pro- 
portions generally, is perhaps referable to this species. It measures 2$ 
inches to the caudal. Depth 7£ in length, head 3^, depth of head 10 and 
width of head 12. Eye 2f in nose (to tip of lower jaw) and 5f in whole 
head, its depth equal to the deeply grooved inter-orbital space. The mid- 
dle of the head is at the front margin of the pupil. 
The dorsal commences half its length in front of the anal. The paired 
fins are very short (Y. 3£ in head, P 44.) The pectorals are nearer ventrals 
than front of premaxillary, and the ventrals are midway between pectorals 
and anal. 
Obscure vomerine teeth extend further back than the palatine bands. 
The cheeks and opercles are wholly scaly. Lat. 1. 125 scales, longitud- 
inal rows 27, from dorsal to anal. D. 14 (complete rays), A. 14, Y 10, 
Rr. 14. 
Color in alcohol dusky, with 12 yellowish, nearly vertical bands, plain- 
est behind, narrow above, but widening below into triangular blotches, 
which merge in the pale color of the belly. A dark stripe extends from the 
tip of the nose to the hind edge of the opercle, and a vertical bar downward 
from the eye. The fins are all dusky. S. A. F.] 
Family AMBLYOPSIDJE, (the Blind Fishes.) 
No species of Blind-fish has yet been recorded from Illinois. 
Suborder ISOSPONDYLI. 
Family PERCOPSIDAC, (the Trout Perches.) 
Genus PERCOPSIS, Agassiz. 
74. Percopsis guttatus Ag. Trout Perch. (M. Y. 270; Nelson 43.) 
Yery abundant in Lake Michigan, caught by the hundred by 
boys from the Chicago wharves. Occasionally found in the larger 
streams through the state. 
